I have a friend that has a manual 1997 Civic LX. I believe it has the D16y7 that does not have Vtec. The car is all stock and a daily driver car for him. He wanted to replace the intake manifold gasket and clean it up etc. So I helped him out. The intake was sucessfully taken out with disconnecting all vaccum hoses that connected to it, fuel hose as well as the coolant hoses. I also dissconnected all the clips that kept the manifold on.

I cleaned up the old gasket with a razor blade and some gasket remover, then put the new one on. I then recconected everything and when I started the car it reved up to 5,000 rpm and idled there for about 3 seconds then it drops down to 1,000... but every time it hits 1,000 it surges up to 3,000 then back down to 1,000. It does not stop doing this after the car is started.

I then tried to drive the car and the idle seems normal when in gear but the car jerks when stepping on the accelerator. Im not sure what is causing this because I am not an expert on the D series motors... so if anyone knows what it could be or what I might have screwed up... please let me know!

 

i had that problem on the b series except mine didnt go up to 5k. it only went to about 3k. i had to take off the idle control valve and clean it out. on a b series, its located on the back side of the intake manifold. for a d-series, im not too sure. i know it has coolant lines going to it and i think vacuum lines also. hope that helps.

 

The D series IAC valave sits on the throttle body. I recconected both coolant lines and coolant is indeed running through it, but ill give that a try. I figured I probably didn't pay close enough attention and recconected a vaccum hose incorrectly or some thing... im not sure though.

If you have any other ideas let me know.

 

just make sure the screen part isnt clogged up. mine had all this white crap on it and after i cleaned it up, it ran fine. good luck with that. i know how much of a pain it is to drive when the cars jerking around

 

Yea, ill deffinatly give that a try later and see what it fixes. Thanks for the ideas and if anyone else has any other ideas, I would appreciate the help.